Improved process



'W. M. PAGE & E. B. KRAUSSE. PROCESS or PREPARING SULPHATE 0F BARYTES.

Patented Sept. 15

gut uh tat-2s gaunt @fi'inL WILLIAM M. PAGE AND EMlL B. KRAUSSE. OF ST. LOUIS, MISSOURI.

Letters PatentNo. 82,154, dated September 15, 1868.

IMPROVED PROCESS. OF PREPARING SULPHATE 0F BARYTES.

To ALL WHOM IT MAY CONCERN:

Be it known that we, WILLIAM M. Pass and EMIL B. KRAUSSE, of St. Louis, in the county of St. Louis,

and State of Missouri, have invented'a new and improved Process for Preparing Sulphate of Barytes and we do hereby declare that the following is a full, clear, and exact description thereof, 'which will enable those skilled in the art to make and use thesame, reference being had to the accompanying drawings, forming part of this specification.

This process is, a simple and effective series of operations for treating the mineral known as sulphate of baryta,'or heavy spar, so called, whereby the mineral is refined and reduced to a fine powder, known in commerce as sulphate of ba'rytes. r

The accompanying drawings represent the apparatus employed in the difi'erent stages of too process.

The tilt, (as the crude, heavy spar, as it comes from the mine, is called,) is placed in a vat, A, (Figure 1,) and covered-with distilled water, which is made to boil by or with steam, conducted through the pipe a to the bottom of the tifi' in the vat.

After being boiled for about an hour it is taken out and dried, and crushedin any suitablo crushing-mill;

The crushed tifi' is then placed in the tub or tank B, (Figure-2,) and again'boiled by steam througha pipe, 6, in a weak solution of any suitable acid, as sulphuric acid.

This operation extracts iron and other impurities usually found accompanying the tifl'.

The acid solution is then drawn oil and replaced by a weak solution of silicate of soda in distilled water, in which the crushed tifi' is again boiled by means of steam as before, the boiling process lasting about an hour.

The till thus treated, is then discharged into avat, C, (Figure 3,) which in practice is located underthe tub B,- so that the till may be readily discharged therein.

In this vat the till" is washed in distilled water and silicate of soda, by means of any suitable stirringmechanism or hand-implement.

This bath is then drawn oil from the vat, and replaced by a saturated solution of alum-water. and again stirred oragitated as before.

The product thus far treated, is then conveyed by a chute, c, orother suitable means, to a copper dryingpan or pans, D, (Figure 4,) in which the mineral is dried by means of steam-pipes or other suitable heatingapparatus.

When dried, the mineral is conveyed to any suitable grindingmill, and reduced to a fine powder.

From the mill it is conveyed, by a chute, e, to a mixing-tub, E, (Figure 5,) provided with any suitably constructed mixing-mechanism, as that shown, where the mine al is again agitated in distilled water from the tank G, and thus thoroughly mixed for floating. 4

It is then conveyed through a trough, H, about one hundred and, eighty feet in length, to a tank or tub, I, (Figure 6,) and left to settle from the water with which it entered the tub I.

From this tub it is then run out into shallow copper pans and dried.

It is then ready for barrelling as the trade'article of sulphate of barytc s.

These are the general steps of' the operation, but we desire to be understood as not limiting ourselves to the precise means for producing the various operations, or the particular form or sequence of the apparatus, or arrangement of the same, as some changes may be made in the same'without materially ali'ectingthe success of the process.

It will be seen from the foregoing that the principal features of improvement oi our process over that commonly used, are- First, the boiling of the tifl in water or by steam-vapor to render it more friable.

Second, boiling the tiff in acid solution to remove impurities,

Third, the use of silicate of soda to remove such impurities as are not affected by the acid-solutions.

Fourthhthe use of alum-solutions to whiten the tifi'.

Fifth, the use of distilled water to obtain sulphate of berytes in greater purity.

And' as each of these features constitutes in-itself a. new and advantageous feature; not dependent upon the others, we desire to secure them agaii'lst appropriation in ether combinatio'ns.

Having thus described our invention; what we claim as new,' and'desire to secure by Letters Phtht, is

The vprocess, substantially as described, for heating sulphate of .bary'ta, and producing therefrom the refined 3 product known to the trade as sulphate of barytes." v

' WILLIAM M. PAGE,

EMIL B. KRAUSSE. Witnesses:

Girls.- H. Emma, Louis "Rmumm. 

